20309+4913 S   755AB

Coord 2000	20309+4913		Discov num	S   755		Comp	AB		Coord arcsec 2000	20 30 52.72 +49 12 47.5
Date first	1825		Date last	2015		Obs	26
Pa first	279		Pa last	278		P.A. Now (θ)	278°
Sep first	61.4		Sep last	59.9		Sep. Now (ρ)	59.9"
Mag pri	6.64		Mag sec	9.72		delta mag (ΔM)	3.08		Spectral class	A2 (white)
Pri motion ra	+001		Sec motion ra	+003
Pri motion dec	-012		Sec motion dec	-016
Notes	N (See Notes)

Visually invisible, K-band or other infrared star rPM=0.275 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		49731	20309+4913	S 755	AB	1825	2015	26	278	59.9	6.64	9.72	3.08		<===
Show		49731	20309+4913	ES 2695	AC	1909	2015	4	118	20.2	6.64	13.50	6.86

Triple system
3 visible stars in this system

Precise pa	277.5		Precise sep	59.866		Constellation	Cygnus		SAO	49731
HIP	101206		Tycho2	3581-00823-1		Gaia DR2	03772460160		HD	195710
BD	BD+48 3148		Distance	147.28		Distance ly	480.43

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20309+4913	S 755	AB	2002	24	278	59.3	6.64	9.72	A2	N D	203052.72+491247.5
20309+4913	S 755	AB	2003	25	278	60.0	6.64	9.72	A2	N D	203052.72+491247.5
20309+4913	S 755	AB	2012	26	278	60.2	6.64	9.72	A2	N D	203052.72+491247.5
20309+4913	S 755	AB	2015	26	278	59.9	6.64	9.72	A2	N	203052.72+491247.5

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